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Title: Laser ablation of metal substrates for super-hydrophobic effect
Authors: Tang, M. 
Shim, V. 
Pan, Z.Y.
Choo, Y.S. 
Hong, M.H. 
Keywords: Contact angle and high speed camera imaging
Laser ablation
Super-hydrophobic surface
Issue Date: Mar-2011
Citation: Tang, M., Shim, V., Pan, Z.Y., Choo, Y.S., Hong, M.H. (2011-03). Laser ablation of metal substrates for super-hydrophobic effect. Journal of Laser Micro Nanoengineering 6 (1) : 6-9. ScholarBank@NUS Repository.
Abstract: Pulsed UV laser ablation is applied to fabricate super-hydrophobic surfaces on metal substrates. The spike shape micro-structure arrays achieved by the laser ablation on the brass substrates increase the surface roughness (Ra) from ~ 400 nm to ~ 5 μm. Meanwhile, plenty of nano-structures (200 ~ 600 nm) are also formed and scattered on the surface of the micro-structures. It is found that the water contact angle of the brass substrate increases from 110° to 161°. Super-hydrophobic property of the metal surfaces with both the micro- & nano-roughness is explained by water repellent model for double roughness structures. High speed camera imaging is used to analyze water droplet dynamics during its rolling down along the slanted super-hydrophobic brass surface. It shows that the pulsed laser ablation is a versatile approach to create large area super-hydrophobic surfaces for industrial applications.
Source Title: Journal of Laser Micro Nanoengineering
ISSN: 18800688
DOI: 10.2961/jlmn.2011.01.0002
Appears in Collections:Staff Publications

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